8491255506 has 96 divisors (see below), whose sum is σ = 21028325760. Its totient is φ = 2460175872.

The previous prime is 8491255499. The next prime is 8491255511. The reversal of 8491255506 is 6055521948.

8491255506 is a `hidden beast` number, since 8 + 4 + 91 + 2 + 5 + 550 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183301 + ... + 224903.

It is an arithmetic number, because the mean of its divisors is an integer number (219045060).

Almost surely, 2^8491255506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8491255506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10514162880).

8491255506 is an abundant number, since it is smaller than the sum of its proper divisors (12537070254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8491255506 is a wasteful number, since it uses less digits than its factorization.

8491255506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41680 (or 41677 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The square root of 8491255506 is about 92148.0086925377. The cubic root of 8491255506 is about 2040.1274675253.

The spelling of 8491255506 in words is "eight billion, four hundred ninety-one million, two hundred fifty-five thousand, five hundred six".